Detonator.



A. PRICE & W. PRYSE.

DETONATOR.

APPLICATION FILED MAR. 21, 1912.

1,047,985. Patented M124, 1912.

"NTTED TATE@ PATENT FFTQE.

ABRAHAM PRICE, OF TREORCHY, AND WILLIAM PRYSE, OF TRIORCHY, NEAR PONTYPRIDD, ENGLAND.

DETONATOR.

To all whom ttf/Lay concern.

Be it lmown that we, ABRAHAM Pinon, timberman, and WILLIAM Pnrsn, colliery fireman, subjects ot t-he King of Great Britain, residing at l0 Sunny Bank, Cwmpark, Treorchy, and 4l Vicarage Terrace, Triorchy, near Pontypridd, Glamorganshire7 England, respectively, have invented certain new and useful Improvements Relating to Detonators, of which the following is a specication.

This invention has reference to devices for the insertion and withdrawal of detonators for shot tiring purposes in mines and quarries and refers to that kind wherein a hollow tube is employed within which is adapted to slide a rod for the purpose of running the detonators into the charge.

Our improved device is designed more particularly for use with the detonator shield described in the specification forming part of an application for Patent No. 665343.

rThe objects of the present invention are to provide a device whereby the operations of inserting and withdrawing a detonator may be eiiiected with perfect safety, to provide a device which is graduated in a standard of measurement so that the depth of the shot hole may be seen and to provide a device adapted to be controlled solely by an authorized person so that the appointed shot rer only can charge and tamp the holes.

In order that our invention may be readily understood and carried into effect we `will now describe the same fully with reference to the accompanying drawings in which Figure l represents an elevation of a device constructed in accordance with our invention. Fig. 2 is a detail view hereinafter referred to.

In carrying our invention into practice we provide a tubular member a having a stirrup or D shaped handle the portion b of which is provided with an aperture through which a rod o may be passed into the interior of the tube a. The rod c is provided at its lower end with a detachable spike l which is secured thereto by an appropriate joint such as illustrated in Fig. 2. The joint shown is of the interlocking type. The rod c is provided at its lower end 'with an extension approximately semi-cir- Speccation of Letters Patent. Patented Bec., 24C, "i912,

Application filed March 21, 1912.

Serial No. 685,211.

cular in cross section having a longitudinally arranged slot cut near the top end thereof. The spike d is provided at its inner end with a reduced portion. the bottom end of which fits into the semi-circular portion of the extension on the rod c. The end of the extension on the spike Z hasV a longitudinally arranged projection adapted to engage with the above mentioned slot the whole being held in a locked position by means of the tubular member a..

The opposite end of the rod c is provided with a disk e to form a scraper the purpose of which will beY hereinafter explained. Means are provided whereby the rod c may be locked within the tube a such as for instance by means ot a cotter pin y adapted to pass through a slot in the top of the rod and to be secured in position by a padlock g the cotter of course being attached to the stirrup shaped handle b such as by means of a chain as shown. The tubular member a is graduated in inches or other standard of Ineasurement so that a record may be kept by the shot tirer of the depth of the shot holes.

The operation of our improved device is as follows The rod c having been removed from the tube a by withdrawing the cotter f the detonator preferably contained in one of our improved shields before mentioned is inserted in the end a2 ofthe tube a. The end of the rod c (the spike Z having previously been detached) is then placed behind the detonator and pushed through the tube taking with it the ring wires which are connected to the detonator the ends of said wires protruding beyond the end of the tube a ready for connecting up to the electric cable. The detonator or detonator and shield then project slightly beyond the end of the tube a; and after insert-ing said detonator into the cartridge this latter is introduced into the shot-hole by means of the tube a the hole being then rammed with clay or other suitable material. After the hole is rammed the depth is read off on the graduated scale on the tube a and the tube withdrawn the hole left thereby being stemmed tor a suitable depth to exclude air from the charge when the shot is fired electrically in the usual manner. Should a mislire occur t-he detonator with its shield is withdrawn by means of the firing wires. Our improved device is then tted together with theA spike d in position and inserted in the shot hole to the same depth as When the hole was charged the spike Z entering the hole left in the base of the cartridge by Withdrawal of the unexploded detonator. This hole is opened out by the spike (l the rod o and the spike (Z being then Withdrawn leaving the tube a in position the scraper e at the end of the rod c is then used to clear out any loose stemming from the hole and the detonator reinserted in the manner first above described the spring tongues or clips of the shield described in our aforesaid prior specification engaging the case of the cartridge and retaining it in position when the tube a is Withdrawn. The hole is again stemmed and red in the usual manner.

It Will be seen that With a device constructed in accordance With this invention the apparatus may be under control of one shot-tirer for the districtthus preventing unauthorized tampering With the shot holes, While at the same time it provides a, means whereby the detonators may be introduced with perfect safety Without risk of premature explosion by friction or otherwise.

IVe prefer to make all the parts of copper Y but any suitable metal or material may be employed.

That We do claim as our invention and i desire to receive by Letters Patent is A device of the type speciiied for the insertion and withdrawal of detonators for shot ring purposes in mines and quarriesY comprising a tubular member having a rod or plunger adapted to slide therein a. detachable spike mounted at one end of said rodV or plunger and means whereby the rod orKV plunger may be locked to the tubular niem- Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents Washington, D. C. 

